oro is stronger than jiraya at this point he can absorb chakra, and has senju dna which probably means he has some type of mokuton, and i doubt jiraya can defeat the Giant White Snake its basically immortal, unless jiraya has totsuka
I'm not comparing the Sannin to eachother, i'm comparing the Sannin (individually) to Itachi.
Orochimaru and Tsunade all together get 1shotted by genjutsu, even if they are/could be stronger they still get caught in the genjutsu and lose.
If Jiraiya goes into sage mode with Ma and Pa he will have no problem with genjutsu.
He will be stronger than Itachi.
Probably also have reflexes on par or better than Itachi's.
Be close to/have higher speed than Itachi.
So unless Itachi's Susano'o with Yata and Totsuka can run 70 mp/h to chase after Jiraiya i don't see Itachi winning.
Btw, No one ever stated that Orochimaru can absorb chakra, unless you're trying to say that because he has a Zetsu body. i highly doubt that he has Mokuton because only time we have seen Zetsu ''use'' Mokuton was when Naruto attacked it and it started growing a tree out of itself due to the Kyuubi chakra.
I have no idea what Giant White Snake you're talking about, maybe the one that Itachi sealed away with Totsuka?
And Jiraiya with all 3 of the giant toads + Ma and Pa would probably have no problem taking out the 9 headed snake.
And a Perfect Jin. Wasn't the Sage a Perfect Jin (for a time)?
OT: I'd say Itachi beats all except Jiraiya.
Being a perfect Jin means having a friendship with your Bijuu and them allowing you to use their chakra freely.
I doubt he was a perfect Jin as we have yet to see the Juubi to have a ''true identity''.
Only time that the Juubi got mad was when his power was stolen (and it is still stolen) and when it saw SO6P inside of Naruto.
I doubt it can speak though, but of course it was once a peacefull being, that was, before Princess Kaguya ate its ''essence'' (giggle).